telnet 127.0.0.1 25 (telnet to a port; use a space for port number.) IMAP webmail uses this. exchange is like IMAP sudo (used to run as root. /etc/sudoers)

log files:

/var/log/maillog (mail stuff)
/var/messages

sendmail is a mail trasfer agent (MTA)

dovecot-POP & IMAP server dovecot.org

sendmail as the MTA

wget (downloads http file)
bc (calculator)

cinepaint

yum list '*cine*'
vim /etc/yum.repos.d/dag.repo

yum install cinepaint

Fermilab-Scientific Linux (SL) Origin www.fnal.gov

ypcat -k auto.master

—-

rpm -qfi '/etc/gshadow'
which xterm (gives the location of the command)

back ticks send output of commands to RPM

rpm -qfi `which xterm`

ssh -XY lukeshouse.net
glxgears (visual demo)

Movie Players:

• xine
• VLC ←-good!
• mplayer

—-

• Latex
• xpdf
• ggv postscrip reader Gnome Ghostview
• ps2pdf converts postscript file to pdf

—- Grad student computer can run out of domain, just enter passwords when using domain resources.

/user/share/sendmail-cf/cf/README /etc/mail /usr/share/doc/sendmail/doc/op/op.ps

/etc/yum.conf /etc/yum.repos.d/*.repo grep enabled=1 /etc/yum.repos.d/*.repo

http://www.oreillynet.com/pub/a/oreilly/linux/news/linuxnut_0800.html

to get root's email: I added you by editing courier:/etc/aliases and then I activated the changes by running “service sendmail reload” on courier.

Re: TSM Backup failed for BACCHUS.AOE.VT.EDU This may be because of today's machine-room shutdown, or it may be for some other reason…

A “ps -ef | grep dsm” on bacchus shows that the backup service is running there, so it's almost certainly due to the power outage. If not, an “/etc/init.d/tsm stop; /etc/init.d/tsm start” ought to do the trick[0].

-Luke

[0] The script that I dropped in /etc/init.d/ doesn't follow the Redhat conventions entirely, but it does work for the important things like starting and stopping. Less important things like “restart”, “status”, “condrestart”, “reload”, and “reread” that you see on some of the fancier /etc/init.d/* scripts are not supported.

Do in Luke's office behind NAT will simplify things. Bill's Dell service tag: CGZY3B1 during install, a local account must be set up. Delete this after install.

remove google desktop

gave up, then reinstalled windows, removing partitions. local admin De12! Aerospace and Ocean Engineering Virginia Tech Domain:aoe.vt.edu aoe/username active directory Users and Computers Move from computers to Acedemic computers gpupdate /force /boot

Temporary ip if not behind NAT IP 128.173.188.28 mask 255.255.252.0 Gateway (Router) 128.173.188.1 DNS Pluto,Neptune Wireles SSID VT_WLAN

VMware GSXserver free

rpm -UvH
^Z bg

—-

DECSS video encryption algorythm used on DVD that was decoded by a kid

ctrl-D(or was that Z) end of file. Stops program waiting on input

ssh -XY

lspci (-n) (ls of hardware)
lsusb (ls of usb)
lsof (open files)

less -i (case insensitive)
cat /proc/pci

ctrl-alt-BS shuts down xserv ctrl-alt-del shuts down computer

x8664

.386

.686 PII & up

find -type f -exec chmod 644 {} \; converts file permissions
find -type d -exec chmod 755 {} \; converts directory permissions

proc/version for version information
proc/ide

start X from the command line using this command:

X :1 & (or ctrl-Z bg)

Then switch back to a tty window with ctrl-alt-f2 and log in. Then:

export DISPLAY=:1
xterm

And switch back to the X session using ctrl-alt-f7 to see the application

To kill X:

ctrl-alt-bs

I added: xauth add :1 . `mcookie` (from a web page)

1-25-2007

^ alt f1 (change windows)
# X :1 (starts Xserver on slot1)
# export DISPLAY=:1
# xclock & (no window manger or frame)

or

# gnome-session &  

window managers:

# twm &
mvwm
afterstep
kwm
icewm
fvwm
fvwm95

to go between boxes

# echo $DISPLAY (tells which one in use)
# xhosts +<remote_host>
# ssh <remote host> or rlogin telnet rsh sneakernet
# export DISPLAY-<hostname>:0
# xclock &

—- lookukp using man these words Luke used:

xargs
mmap
fgets
fprintf
fget
ps -ef | grep xterm
ps -ef | grep glxgears
emacs
gvim index.php
cd campioli/ (on bacchus)
gimp vorticity_3D_iso2_www.jpg
cd /www/aoe-html/bannerimages/

—- http://www.cyberciti.biz/faq/running-multiple-x-sessions/ The startx script initialize an X session. You can use the same to run multiple X session. Switch to console mode by pressing CTRL+ALT+F1. Provide your login details and type the following command to start X session:

startx -- :1

By default the first X session runs on screen 0. However, you can run the second X session on screen 1, the third on screen 2, and so on. The above startx command tell X to run on screen 1. To run X on screen 2, you'd use the command

startx -- :2

How Do I Switch Between X Sessions?

1. To go back to the screen 0 user X session, press Ctrl+Alt+F7

2. To go back to the screen 1 user X session press Ctrl+Alt+F8.

3. To go back to the screen 2 user X session press Ctrl+Alt+F9.

4. Please note that F7 to F12 identify six X sessions.

run X-Config
Host Name: aries.soe.vt.edu
Login: username
command: /usr/X11R6/bin/xterm -ls (for xterm window, which is usual case.)
default PuTTY settings with SSH2 Flags.

same for Bacchus

using remote X on windows:

start x-win32 then, in systray, right click on X and open session of choice. Now running graphical applications will appear on the windows box, but are running on the linux system!

some things to run:

xclock
xcalc
#dsm from (alexandria)
gimp

makefile stuff: for normal programs that need to be compiled from source (rare) ./config

make
make install (?)

make -n (do nothing)

GCC
Perl GTK
C++
G++
yum list '*gcc'
dlopen

.so files are equivalent to dll

nm lists functions in .so files (dlls)

—-

Dowload and install kernel SRPM:

# rpm -ihv ftp://ftp.scientificlinux.org/linux/scientific/5x/SRPMS/vendor/kernel-2.6.18-53.1.4.el5.src.rpm

Unpack kernel source and apply all patches:

# cd /usr/src/redhat/SPECS
# rpmbuild -bp kernel-2.6.spec

Kernel source is now in /usr/src/redhat/BUILD/kernel-2.6.18/linux-2.6.18.i386

 Urs

ssh bacchus
grep root /www/common/include/aoe_mysql.inc.php
grep mysql_connect
mysql -p -u root
>show databases; (end all statements with ;)
(databases in /var/lib/mysql
>use givingdb;
>show tables;
>describe givingdb.donors;
>select * from donors;
>insert into types set tag="Student";
(select, insert, update, delete are some commands)
>show create table calevents; (shows the sql statement to do the command)

log in “graphically” as root to alexandria –ssh -XY

#dsm or #dsmj (on alexandria for restore from nightly backup.)

only six tape machines available

#dsmj (on athena for restore from nighly backup.)

—-

these need to be addressed in websites and in the database.

Luke's new boss: Tim Rhodes Sun machines run Solaris

Luke's cell: 818-5876 New house address: 5795 pifer Dublin, Va

su to root tail -f /var/log/messages

use epylog for multiple machines uses Logwatch by default for local machine /root.forward and put email in this to get messages

google VMD used by NIH to visualize molecular dynamics used in biochemisry and biology.

athena's original disk setup-swap was later moved to its own partition

v LVM Volume groups                         MB
 v VolGroup00                          1791744
    LogVol01            swap              1024
 
v   /dev/sda
     /dev/sda1           /boot    ext3      102
     /dev/sda2           /        ext3    18999
     /dev/sda3           /tmp     ext3    10001
 v  /dev/sda4          extended           11853
     /dev/sda5           /var     ext3    10001
     /dev/sda6        VolGroup00  LVMPV   1851
rest
 LVMPV

…

03:01.0 RAID bus controller: 3ware Inc 9550SX SATA-RAID
07:04.0 Ethernet controller: Intel Corporation 82541GI/PI Gigabit Ethernet Controller (rev 05)
07:06.0 Ethernet controller: Intel Corporation 82541PI Gigabit Ethernet Controller (rev 05)

Backups ypcat auto.master ypcat auto.home ⇐contains partitions

/etc/initd ⇐script /etc/rc.d/rc0.d ⇐for different init modes /etc/rc.d/rc1.d ⇐etc, etc through 6

chroot ⇐changes a branch to appear as the / directory

unshare from samba on alexandria

/etc/samba/smb.comf

comment out /caplab

service smb reload <=to activate changes without disconnecting everyone

/etc/exports

comment out section group for /caplab

/sbin/service nfs reload

unmount

remount in /tmp

edit exports on athena

copied /caplab section from alexandria to athena

unmount /mnt/tmp

/etc/init.d/nfs reload
/etc/init.d/nfs start
chconfig nfs on
chkconfig portmap on <= since nfs is always on a different port this resolves

the port address for nfs

mount athena:/export/caplab /mnt/tmp
ls /dev/vg0 will list /caplab
cat /proc/lvm/global

Active directory

(see screenshots)

DefaultMigrationContainer30
adsiedit
msSFU30NISMAP Entry
c:> nisadmin /syncall
ypcat -k -h pluto auto.home

Http://ntsyslog.sourceforge.net/

(15:51:25) lscharf@im.iad.vt.edu: My process is usually: (15:51:43) lscharf@im.iad.vt.edu: 1. Move user to the graveyard OU in Active Directory, disable the account. (15:51:52) lscharf@im.iad.vt.edu: 2. Wait a reasonable amount of time for them to complain, in case of a mistake. (15:52:06) lscharf@im.iad.vt.edu: 3. archive_user & delete from Active Directory (15:53:06) lscharf@im.iad.vt.edu: 4. Use the “archive” feature in DSM/TSM/whateveriscallednow to store the account-information long-term. Also, DSM can delete the files as it archives them, which is slightly scary, but it makes the bookkeeping easier. (15:54:04) lscharf@im.iad.vt.edu: There's no reason anyone has to do it that way, but I found that it kept everything organized. (15:54:19) steve: if the account is not disabled, can they still log in if just moved to the graveyard? I set the account to expire AFTER today. is there a more appropriate way to disable the account? (15:54:44) lscharf@im.iad.vt.edu: Right-click on the account and choose “disable”.

watch ls -lh omarzouk_2006-08-19_2701.tar.gz mtonks_2006-08-19_2797.tar.gz suvasud1_2006-08-19_2890.tar.gz

[root@alexandria graveyard]# /home/sysadmin/bin/archive_user.sh suvasud1 Searching file the user's files in /home/grad /home/facultystaff /home/undergrad /home/diskhogs /home/grad2 … Found “/home/diskhogs/suvasud1” : 61G /home/diskhogs/suvasud1 61G total

Tar'ing up the user's files… nice -n 19 tar -zcf /home/sysadmin/graveyard/suvasud1_2006-08-19_2890.tar.gz “/home/diskhogs/suvasud1” tar: Removing leading `/' from member names

To check the contents of the archive:

      tar -ztvf "/home/sysadmin/graveyard/suvasud1_2006-08-19_2890.tar.gz"

To remove the files that were just archived, manually run the following command: rm -rvf “/home/diskhogs/suvasud1”

[root@alexandria graveyard]# /home/sysadmin/bin/archive_user.sh mtonks Searching file the user's files in /home/grad /home/facultystaff /home/undergrad /home/diskhogs /home/grad2 … Found “/home/grad/mtonks” : 20G /home/grad/mtonks 20G total

Tar'ing up the user's files… nice -n 19 tar -zcf /home/sysadmin/graveyard/mtonks_2006-08-19_2797.tar.gz “/home/grad/mtonks” tar: Removing leading `/' from member names

Broadcast message from nutmon (Sat Aug 19 19:38:16 2006):

To check the contents of the archive:

      tar -ztvf "/home/sysadmin/graveyard/mtonks_2006-08-19_2797.tar.gz"

To remove the files that were just archived, manually run the following command: rm -rvf “/home/grad/mtonks”

[root@alexandria graveyard]# rm -rvf “/home/grad/mtonks”

/home/sysadmin/bin/diskhogs.sh

du -sk * (lists sizes of directories.)

Broadcast message from nutmon (Sat Aug 19 19:38:16 2006):

UPS zeus@192.168.88.1 on battery

Broadcast message from nutmon (Sat Aug 19 19:38:20 2006):

UPS zeus@192.168.88.1 on line power

UPS zeus@192.168.88.1 on battery

Broadcast message from nutmon (Sat Aug 19 19:38:20 2006):

UPS zeus@192.168.88.1 on line power

How to reload the ypserv database on alexandria. These commands are not all required. Some were issued in trying to find the right ones. ypserv restart

/etc/init.d/ypbind restart
/etc/init.d/ypserv
/etc/init.d/ypserv reload
/usr/lib/yp/ypinit -s
/usr/lib/yp/ypinit -s pluto.aoe.vt.edu
/etc/init.d/ypserv restart

What is the difference between

service nfs reload
/etc/init.d/nfs reload

Basically, nothing.

nisadmin /syncall (on windows)
watch ls

Dan's friends: Rob and Chris

Madhu uses jed to edit html.

MSC.nastran license

Wanda emailed Cassandra Radigan (cassey.radigan@mscsoftware.com) to update MSC software licenses. She sent quote for 3,800, the academic price. Benjamin Kelly [benjamin.kelly@mscsoftware.com] sent an email with a temporary license. The Installation and Operations Guide (hard copy page 32) explained the procedure.

On licenseserver, go to FLEXlm License Manager on the control panel. On the setup tab, look for the location of the license files. C:\Msc\FLEXlm\licenses\msc_license_2006-08-30_temp.dat place a new file in this location from the email. Be sure to update the hostname. Stop the license Manager from the control tab. from the setup tab again, replace with old file with the new one. Start the service from the control tab. I also updated license.dat in C:\flexlm\Nastran. I don't think this is required, but hey.

If you delete c:\texmf, the automatic-install script should run again, during the next reboot.

If the script does not run, you can run my installer from, IIRC: “ \\alexandria.aoe.vt.edu\packages-win32\latex”

-Luke

Scott Kowalchuk wrote: Luke-

I seem to not have the Miktex\bin. I have localtextmf\miktex\ → no bin and texttmf\ → no miktex

Does this mean that miktex isn't setup?

Thanks, SAK Luke Scharf wrote:

sako@aoe.vt.edu wrote:

On the computers in the SSSL lab, Texnic wants the location of the Latex executables. Miktex is on the computers. Have you had this problem in the past?

Yes. It's one of those problems that can only be documented away. Here's my writeup on the topic:

   10.4.1 TeXnicCenter Per-User Setup
   TeXnicCenter Configuration Wizard Step-Through:

   Upon launching TeXnicCenter 6.30 for the first time on a specific
   machine, a "Tip of the Day" window

• Click ’Close’;

Then, the “Configuration Wizard” window may launch

         automatically as well, if you’re using TeXnicCent
       * Click ’Next’;
       * type in:
         C:\TEXTMF\MIKTEX\BIN\
         into the textbox field (to specify the full path of the
         directory, where the executables of the Te
       * Click ’Next’;
         -type in:
         C:\TEXTMF\MIKTEX\BIN\YAP.EXE
         into the *first* textbox field (to specify the full path of
         the DVI-viewer to use).
       * Click ’Next’;
         Accept defaults, or you may choose to enter *one* of the
         following:
         C:\PROGRAM FILES\ADOBE\ACROBAT 7.0\DISTILLR\ACRODIST.EXE
         C:\WINDOWS\NOTEPAD.EXE
         (to specify the full path of the PostScript-viewer to use).
       * Click ’Next’;
         make sure
         C:\PROGRAM FILES\ADOBE\ACROBAT 7.0\ACROBAT\ACROBAT.EXE
         is entered as the full path of the PDF-viewer to use.
       * Click ’Next’;
       * Click ’Finish’.

Here's the writeup that I did for Ben to get him started on distributing applications via GPO in Active Directory. I leave out a lot of context, since he's run Windows AD stuff before – but that's fine in this crowd.

Also, the justification section was something that I slapped together, in case his boss wanted a justification for these kind of changes.

-Luke

——– Original Message ——– Subject: Re: active directory & apps Date: Thu, 17 Aug 2006 14:21:06 -0400 From: Luke Scharf lscharf@vt.edu <mailto:lscharf@vt.edu> To: Ben Pfountz bpfountz@vt.edu <mailto:bpfountz@vt.edu> References: 44E3D6C5.9030503@vt.edu <mailto:44E3D6C5.9030503@vt.edu>

Ben Pfountz wrote:

I am working on a long term plan for the psych department, and I

remembered you say that aoe uses active directory groups/containers (?) to install apps on certain machines? That sounds sooo frigin cool, do you have any reference material on that? I would love to give it a shot…

This looks like a good introduction to what they were thinking: http://www.microsoft.com/technet/prodtechnol/windows2000serv/howto/instmain.mspx

For a typical program, the procedure goes something like this:

1. Make the package available

1.	Find or generate a .msi file that contains the application.
	
2.	Place the foo.msi on a \\server\share.  This share is somewhat

special, because the system user on Windows needs to be able to read it. It's probably fairly straightforward to set this up in a Windows environment, but there's a trick to it on Samba.

2. Create the deployment policy

1.	Open the Active Directory Users and Computers editor.
	
2.	Pick an OU or container that holds the machines on-which you

want to install the software. Right-click on it, and choose “Properties”

	
3.	Find or create the GPO object that contains the software

installation policy. (It's just like the other GPO objects). Once it's there, click on the “Edit” button.

	
4.	Go to "Computer Configuration" | "Software Settings" |

“Software Installation”.

5.	Right-click in the empty-space in the window, select "New" |

“Package”. Browse to the file that you placed in step 1.

3. Reboot the workstations. Sometimes the change doesn't catch – in that case, run “gpupdate /force /boot” on the CLI; this will force a refresh of the group policy and reboot the computer.

This stuff can be a real PITA to debug, since you don't get a lot of feedback on why the installation might have failed. The Event Viewer on both the client and the fileserver can be helpful, though.

Here's a good program for generating MSI files for those vendors who refuse to generate official ones:

  http://www.ondemandsoftware.com/PurchaseLE.asp

Note that it's quirky on Windows 2003 server - it's easiest to generate the MSI files on a Windows XP box. The WinInstall folks recommend generating the MSI packages inside a VMWare virtual machine, and having tried it both ways, I agree. WinInstall LE makes generating MSI packages for well-behaved applications easy.

Microsoft office is neither small, nor particularly well-behaved. Here's a guide on how MS recommends distributing Microsoft Office via GPO - since MS Office is a big application, it's somewhat more complicated then most:

  http://office.microsoft.com/en-au/assistance/HA011402011033.aspx

If you plan to deploy Matlab or LaTeX via GPO, let me know - these were particularly memorable battles, and I can write up a cheat-sheet for you. Also, Autocad and Unigraphics, though I wouldn't expect them to be popular in Psychology.

Justification: I found it to be a major timesaver for me - and it also greatly increased the security, since I could mandate that all Windows machines in the domain run the most current virus scanner. Add WSUS into the mix, and the routine maintenance on the Windows machines can done with much better better coverage and consistency than I was ever able to achieve with manual administration – in much less time… Time that can be spent on the myriad of other IT-related tasks!

I hope this helps! -Luke

To change file permissions for Webpages: cd /home/sysadmin/bin ./fix_website_permissions.sh stedwar1

750 for folders 640 for files

Student organization web sites can be webmastered(ugh) by the students using a local log-in on bacchus

(15:12:45) lscharf@im.iad.vt.edu: Usually, I just have to ssh to root@bacchus“passwd auvt”, and enter the new password. If you look at the account's home directory (~auvt), you can look for a file called “.htaccess”. That's the configuration file for the restricted access. It also has a reference to the userlist.

www.hps.vt.edu is a virtual web server. There are several virtual hosts on bacchus. You can browse the list in /etc/httpd/conf.

The real entries are in the mx-cnames file, which is processed by the script along with ip.txt

The pages for displaying or editing internal lab safety info seem to have quit. The editing page, for example is… https://www.aoe.vt.edu/computing/online/labsupport/labsupport_document_edit.php

URL maps to bacchus:/www/secure-html/computing/online/labsupport/labsupport_document_edit.php

The list that is here comes from the database: https://www.aoe.vt.edu/computing/online/ tail -f /var/log/httpd/error_log Then reload the page (or http://www.aoe.vt.edu/labsupport/labsafety.php) Whatever the page is doing, it's taking 32mb of RAM to do it.

One possibility is that someone put a huge document into the database and it's overflowing the memory.

Luke: I'm going to play with fire and let php use more memory. Steve: I'll get the extinguisher. Luke: I quadrupled the memory limit, and it works now. It makes the problem go away for a while. Until the number of documents in that table quadruples in size. It's not a real solution, but it should make it a non-issue.

The memory-quantity is set in /etc/php.ini on line 203

The code is /www/common/include/dblayout*.php

Short List: Richard W Godbee Jackie Meese Zeb Bowden

Luke 20 pts Mark Warbeck 15 pts ESM Denton Yoder 30 pts AgE Steve 10 pts

The PIN for the A/V equipment is 70113 in McBride 113.

On Pankaj's computer, he was having trouble with the patran uninstall and niether would the install work again because it said it was already installed. We removed the key for patran from these instructions: http://support.microsoft.com/default.aspx?scid=kb;en-us;310750&Product=winxp in HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall

I also removed removed registry key HKEY_LOCAL_MACHINE\SOFTWARE\MSC…Patran.

The install then work.

Then on the install, enter 1700@licenseserver.aoe.vt.edu

RDP port 3389

Kiwi
eventidinet
AD Backups!
Sophos- Anti-Virus
nano (vi like editor)

————

http://support.microsoft.com/default.aspx?scid=kb;en-us;324764 booted with win2000 cd and entered R,C. listsvc disable agp440 enable agp440 SERVICE_START_BOOT (?) this did not work.

tried /sos in boot.ini and it halted after the Win2000 screen came up which is after the drivers load.

Tried recovery (R,R) on the install disk

vgscan
vgdisplay
vgchange -a y
mount /dev/VolGroup00/LogVol00 /mnt
umount /mnt
vgchange -a n

If LVM2 shows some warnings like “Incorrect metadata area header checksum”, it’s certainly because it checks some partitions without LVM support (x8e). The filesystem works fine with this message but you can get rid of it, exclude not LVM partitions by editing /etc/lvm/lvm.conf :

filter = [ “r|/dev/cdrom|”, “r|/dev/hda1|”, “r|/dev/hda3|” ]

Use fdisk to know the partitions to exclude and run vgscan to test.

# umount /home
# lvextend -L+1G /dev/myvg/homevol
# resize2fs /dev/myvg/homevol
# mount /home

# umount /home
# resize2fs /dev/myvg/homevol 250G  (must know size wanted; cannot use + or -)
# lvreduce -L-1G /dev/myvg/homevol
# mount /home

http://www.troubleshooters.com/linux/ext2toext3.htm convert ext2 to ext3

tune2fs -j /dev/AthenaData2/softvault

man 2 kill (to view man page for kill(2))
man -a kill (to view all man pages)

$ man -k kill    #(keyword)
$ apropos kill    #(similar to man -k)
$ info kill    #(info pages)
$ help kill   #(bash built-ins)
$ locate kill | grep /usr/share 

UNIX System Administration Handbook ISBN: 0130206016

to check interupt issues:

# cat /proc/interrupts
# dmesg
# lspci -vvv

Hardware details:

# lspci
# lspci -v
# lspci -vv

Additional information from lspci stored in /usr/share/misc/pci.ids

# dmesg

or /var/log/boot.log

/proc

# cat /proc/cpuinfo
# cat /proc/ide/ide0/hda/driver
# cat /proc/ide/ide0/hda/capacity
# cat /proc/ide/ide0/hda/model
# fdisk -l
# fdisk -l /dev/hda
# dmidecode
# lshw (not installed)
# lsusb
# sensors (not installed)
# hdparm 
# lshal

After downloading your image into your Linux box, do this:

   1. As root, type:

          cdrecord -scanbus 

      ... in order to determine the device. It will be something like '0,0,0'
or just '/dev/cdrom':

   2. Next type:

          cdrecord -dummy -v -pad -eject dev=/dev/cdrom sample.iso 

      ... in order to perform a test run. Remove the -dummy flag (but keep
'dev=') to do it for real. You can also add a -eject to cause it to eject when
complete; and -pad to pad tracks with 15 sectors with blank space. By adding a
speed=x (where x can be 2, 4 ... 16, etc.), you can control the speed of the
burn and counter 'buffer underrun' errors, if present. 

That's it!

from user space, Luke used

cdrecord --eject --verbose CentOS-5.0-i386-bin-1of6.iso

[stedwar1@hephaistos Apple]$ cdrecord --eject --verbose dev=/dev/dvdwriter -dao Mac_OS_X_104_Tiger_dvd.iso
[stedwar1@hephaistos Apple]$ cdrecord --eject --verbose dev=/dev/cdwriter1 -dao Mac_OS_X_104_Tiger_dvd.iso

To burn CD's as user root must have access to files: sudo cdrecord -dao dev=/dev/cdwriter /home/facultystaff/stedwar1/FC-6-i386-disc1.iso

The -t option is legacy….

$ ssh-keygen -t rsa

put this in .ssh/authorized keys.

$ cat id.rsa.pub >authorized_keys

There are four files:

1. authorized_keys – This is where you put keys to let people in.
2. id_rsa – This is the private key
3. id_rsa.pub – This is the users public key
4. known_hosts – This is the big list of all the hosts the user logs into.

remove unused keys in serhat's directory.

http://kitenet.net/~joey/blog/entry/locking_down_ssh_authorized_keys/

http://www.enterpriseitplanet.com/security/features/article.php/3797276

steve@steve-thinkpad:~$ ssh -L 33389:192.168.1.101:3389 192.168.1.10 -p 32777
steve@steve-thinkpad:~$ rdesktop localhost:33389

To tunnel to nomahince:

ssh -L 33389:charon.aoe.vt.edu:22 riccioli.ipv6.aoe.vt.edu -p 32777
Then use nomachine to connect to localhost port 33389

To tunnel to neptune:

ssh -L 33389:128.173.188.26:3389 riccioli.ipv6.aoe.vt.edu -p 32777
rdesktop localhost:33389

dink:~ jmjones$ ssh -R 8110:mail.myisp.com:110 ezr

http://troy.jdmz.net/rsync/index.html

Autobackup: rsync -azt –delete-during -a archive -z compress -t time, implied with a –delete removes files not on original set from backup set –delete-during removes files as backup happens crontab -l rootat

to change permission on serial port

chmod ... /dev/tty/so

also a tool exists to chage permission or logon from RedHat.

http://www.cd-adapco.com Star-CCM+

Downloaded license manager items to c:\star-ccm+ on licenseserver4.aoe.vt.edu from macrovision, from a link on the cd-adapco web site. https://support.cd-adapco.com

steve.edwards@vt.edu name-number

A link on the login page got me to macrovision to the flexlm files, except I also had to get cdlmd.exe out of the flexlm download on cd-adapco's site, so it would have been just as good to get all from cd-adapco.com

I dropped these files in c:\star-ccm+\ and made them work with lmtools.

In lmtools, I added a service from the Config Services tab, and pointed everything to the files in c:\star-ccm+

I had to modify the VENDOR line to: VENDOR cdlmd C:\Star-CCM+\cdlmd.exe for star-design to work.

Uses 1999@licenseserver4.aoe.vt.edu

To get the bits for the program, use the download area of https://support.cd-adapco.com

The products licensed are: Star-CCM+ Star-CCM+/Design not the others like Star-CD, Star-Design

Installation seems straightforward. Asks for the license server.

Install documentation first. I have use html version and the abaqus web server javaw asked to open firewall. see sofware_license_managment.xls for server information

delivered two Dell 690's to Femoyer for Kapania's students. During Davide's setup I noticed a dhcp problem in Femoyer. Gave it 128.173.105.54, and unused address for gtech2. Later in room 325 fixed a problem with powerpoint. It needed a visual basic runtime install. The error was something needed to be registered.

The dchp problem occured again in Femoyer 330, with Chengu(sp?)'s machine. About a week ago, it had network problems. It had a static address of 128.173.105.220(?). It would not accept a dhcp. I called NOC and spoke with Steve and he noticed the dhcp address leases were all used. he gave me a number of 316004 and later called and said the problem was resolved.

printer in Femoyer 205 is HP 2200d

Mahdu wants a calendaring/Planner software, besided office.

Plotter paper problem: spoke with HP, Hosea. Warranty good to 11 Feb 2008. gave me 321 776 4594. Spoke with Zack, then avangelos.

SGI Altix CD's

Case ID 2697532

cat /etc/*release

David Norris, Microsoft–spoke about Office 2007

Support for network projectors

Share Point

Alt-Key brings back menues

.ost is cached copy of pst on network

tabs

ribbons- click to hide

user Migration tools

alt

change .docx to .zip and the xml contents can be seen

radmin

Share Points v3 supports most browsers

670 (??)
42" x 150'
C

bootcfg /delete /ID 1 (or 2)

14959 (??)

• 1280×1024 19“
• 1600×1200 20” Dell 2007FP
• 1680×1050 20“wide Dell 2007WFP
• 1680×1050 22”wide Dell 228WFP
• 1680×1050 22“wide Dell 2208WFP
• 1920×1200 24”wide Dell 2407WFP, 2408WFP
• 1920×1200 27“wide Dell 2707WFP

Jackie Meece Presented

pam_ed-auth

mirrors.vbi.vt.edu

smart (like yum)

PAM_LDAP required for suse, not red hat

Red hat needs nss_ldap

open ldap

sis faster thatn smbfs (?)

/etc/ldap.conf

uupid

! in shadow means no login.

nscd caches accounts

smb3 coming up

openwrt firmware on linksys routers could be a consideration for printer firewalls.

• Jeff – web integration help
• Lee Dicky, Desktop support
• Ryan Spoon, incumbant for Tommy
• Amin, Desktop support SWAT

Dino- instructional tool

classroom presentor 
                   \ These not as easy to use
ubiquitus presentor/

addlogics, wireless projector

/aoe

 abaqus
 Intel compilers
 Nastran
 Ansys

/opt

 lives on machine

/etc/profile.d

/

/etc/sysconfig/network (has host names)

/etc/sysconfig/network-scripts/ipconfig-eth0 (has ipconfiguartions)

called 1-800-551-1490 s/n 400-93122639 (also on software.engr.vt.edu) Inventor Pro11 first Autocad 2007 Mechanical Desktop with Inventor

Flexlm 10.8 and up flash = flash dwfviewer = aev mdac 2.7 sp1 = /support/

1-3424

installation observations: Not quiet : wse visual fortan 9.0 installs every reboot gl-gauss - No inventor , still acad 2005, configure Analysis Server 4.1 gl-newton - same as above dl-maine No inventor dl-apollo1 won't run acad

No hardware acceleration: Hyperion Mercury Encaladus iapedus mimas

gl-gauss snap-in failed to initialize, name: <unknown> clsid:{4, DS1410D service failed to start.

model center m.m@vt.edu (????)

382-6557 (????????)

1/19/07 PCland EE01353

Whitney's TV is 32” Samsung

gl-iapetus monitor 2005FPW

wildfire jabber.org

NIST recommends one wipe adequate to clean hard drive.

bluej is a java compiler

awk '{ sub("\r$",""); print }' filein > fileout

openfoam

http://www.hostingforum.ca/273271-windows-server-2003-sp2-print-print.html : I found out from MS Support that apparent SP2 has some changes in the way SNMP is handling printer queues. It now does multiple SNMP threads for the printer queues instead of 1 round robin. To resolve this, check if your printer's SNMP is working properly. To workaround, in the Printers and Faxes folder, File > Server Properties Goto Ports Tab > Click the offline Port > Configure Port Uncheck “SNMP Status Enable” OK

This will turn off SNMP querying and set the printer to always Online.

Home automation equipment:

insteon www.insteon.net

campus DNS:

198.82.247.34
198.82.247.98
192.82.247.66

Campus Network Time Protocol servers:

ntp-1.vt.edu
ntp-2.vt.edu
ntp-3.vt.edu

http://technet.microsoft.com/en-us/library/Bb742433.aspx

Kerberos config file

krb5.conf

Setting up valkyrie to use kerberos:

Added pam_krb5.so.1 entries to pam.conf

man pam_krb5

works with the verify_req_ap_nofail option set as described in the man page

Without the option, it does not have an entry in the /etc/krb5/krb5.keytab file

Export keytab file for valkyrie on neptune:

>ktpass princ host/valkyrie.aoe.vt.edu@AOE.VT.EDU mapuser AOE\valkyrie +rndPass -out valkyrie.keytab

http://support.microsoft.com/kb/321044/en-us

mount /dev/sdc1 /mnt/usb

nice rsync -avt --progress /home/sysadmin /mnt/usb/

"rsync -ax /orginal/ /target/" for file copy 

tar'ed the file with:

nohup nice tar -cf /foo.bu.tar /fooSource &

split the file into 500MB chunks with:

nohup nice split --line-bytes=500m foo.tar.gz foo_ &

rejoined the file with:

nohup nice cat foo_a* > foo_FULL.tar.gz &

View dmesg after plugging in a usb device and look for the speed.

USB 2.0 operates at high speed, defined as 60MB/s (480Mb/s), which is 40 times faster than USB full speed. USB 1.1 operates either at full speed, which is 1.5MB/s (12Mb/s), or at low speed, which is 1.5Mb/s.

useradd -u UID -g GID -c "User full name" -d /export/home/$LOGNAME -m -s /bin/ksh loginID 

The -m creates the user home directory if it does not exist.

rpm -qf /etc/yum.repos.d/sl4x-errata.repo (-qf for file stuff) rpm -qa |grep yum-conf rpm -ql yum-conf-4x (list files that belog to package)

yum insatll yum-conf-4x

/etc/redhat-relaese

Trow Dawson at SL commented on how to reinstall an app using yum.

You will need to do a

yum clean all
yum update openssh\*

To install everything!!! Yikes!

yum install "*"

# yum shell
erase yum-conf
install yum-conf-5x
run 

yum install yum-conf-epel

then disable it in /etc/yum.repos.d/epel.repo

yum install rdesktop lynx vim-X11 gettext-devel.x86_64 denyhosts lyx compat-gcc-34-g77 subversion.x86_64 sysstat scipy numpy lapack.x86_64 compat-libstdc++-33.x86_64

General sl6 Machine Setup

yum install yum-conf-sl6x
yum install yum-priorities
yum install elrepo-release
yum install epel-release
yum install rdesktop lynx vim-X11 gettext-devel thunderbird denyhosts gnuplot subversion compat-gcc-34-g77 lyx numpy scipy lapack python-matplotlib ksh screen
yum --enablerepo epel-testing install scipy (scipy is now available in the main epel repo)

sysadmin tools

yum install yum-conf-rpmforge
yum install iperf
yum install iftop

Dell Bios upgrade (still did not work)

yum install compat-libstdc++-33
yum install compat-libstdc++
yum install libstdc++
yum install libxml2
yum install compat-libstdc++-33.i686
yum install libstdc++.i686
yum install libxml2.i686
yum install procmail

OpenFOAM

yum groupinstall "Development tools"
yum install libXp
yum install cmake
yum install zlib-devel
yum install libXt-devel

paraView

yum install qt-devel

for Matlab:

yum install libXp

for Patran:

yum install openmotif22
export LC_ALL=C

for Gridgen:

yum install libXaw

for Visual Doc:

yum install java-1.6.0-openjdk-devel

gecko-libs is provided by firefox.

# rpm -q --provides firefox | grep gecko
gecko-libs = 1.8.0.12
gecko-libs = 1.8.0.12 

sudo yum whatprovides /etc/selinux

Are you sure the package is actually there?

rpm -qa | grep packagename

what errors does rpm -e packagename actually show?

…

However, if all you want to do is “reinstall a fresh copy” this is easy:

rpm –install –replace-pkgs packagename.rpm

$ rpm -qi htop
Name        : htop                         Relocations: (not relocatable)
Version     : 0.6.6                             Vendor: Dag Apt
Repository, http://dag.wieers.com/apt/
Release     : 1.el5.rf                      Build Date: Sat 02 Jun 2007 04:30:01 AM EDT
Install Date: Mon 02 Jul 2007 04:09:17 PM EDT      Build Host: lisse.leuven.wieers.com
Group       : Applications/System           Source RPM: htop-0.6.6-1.el5.rf.src.rpm
Size        : 149023                           License: GPL
Signature   : DSA/SHA1, Sat 02 Jun 2007 10:11:07 AM EDT, Key ID a20e52146b8d79e6
Packager    : Dag Wieers <dag@wieers.com>
URL         : http://htop.sourceforge.net/
Summary     : Interactive process viewer
Description :
htop is an interactive process viewer for Linux.

To get a list of all the keys in your rpm database system:

# rpm -qa gpg-pubkey\*|sort -

rpm -qa --nodigest --nosignature | egrep 'jdk|java|j2c'

Unfortunately when yum is told to pull in some kmdl it will have to choose between all available versions and will choose one that you don't want.

So it's better to tell yum what to get exactly and not the decision to yum. You can do that with:

yum install ieee80211 ieee80211-kmdl-`uname -r`

(assuming you want to point yum to the current kernel, replace `uname -r` with something else if you need to)

Same for any other kernel module. – Axel.Thimm at ATrpms.net

Here is a quick set of commands that you can cut and paste, wich will create a build directory called rpmbuild in your home area, and setup your rpm enviroment so that you use it.

mkdir -p rpmbuild/{SOURCES,SPECS,BUILD,SRPMS,RPMS}
mkdir rpmbuild/RPMS/{i386,i586,i686,noarch}
echo "%_topdir $HOME/rpmbuild" >> .rpmmacros
echo "%debug_package %{nil}" >> .rpmmacros

Troy

Remove old package:

rpm -U --oldpackage samba-client-previous.version samba-server-previous.version samba-common.previous.version

Exclude it from automatic updates?

Edit /etc/yum.d/yum.cron.excludes and add samba* at the end of the line.

Excluding it from all updates?

Edit /etc/yum.conf and put in the line

exclude=samba*

Troy

You can read the upstream errata at:

http://rhn.redhat.com/errata/RHSA-2007-0964.html

Or, download the latest openssl rpm from SL and do a:

rpm --changelog -qp openssl-xxxxx.rpm

Hope this helps,

Akemi

$ rpm -qp  --requires /opt/instsl/upstream/5x/i386/SL/yum-utils-1.0.4-3.el5.noarch.rpm
/usr/bin/python
python >= 2.4
rpmlib(CompressedFileNames) <= 3.0.4-1
rpmlib(PayloadFilesHavePrefix) <= 4.0-1
yum >= 3.0.1-5
yum < 3.1.0-0

so it wants a yum version of at least 3.0.1-5 and less than 3.1.0-0.

You could create a repo file pointing to the dvd. This is how centos does it.

example:

[c4-media]
name=CentOS-$releasever - Media
baseurl=file:///media/cdrom/
       file:///media/cdrecorder/
gpgcheck=1
enabled=0
gpgkey=file:///usr/share/doc/centos-release-4/RPM-GPG-KEY-centos4 

The src.rpm are in

ftp://ftp.scientificlinux.org//linux/scientific/5x/SRPMS/vendor/

You probably already found out that if you do a

yum remove xorg-x11\*

that is is going to remove most everything along with X. So, here is what I would do

rpm -qa | grep xorg | sort > /root/rpmlist.xorg

This saves things off, so you can get back to where you started

I would then do

cat /root/rpmlist.xorg | while read line
do
  echo $line
  rpm -e --nodeps $line
done

Troy

rpm -q --scripts <rpm>

The problem with bad preun and postun scripts is that they are next to impossible to fix after they are installed. If they are really bad, the user has to manually remove the rpm's. And such is your case.

To get rid of the problem rpm you need to do

rpm -e --noscripts lam-libs-7.1.2-8

Otherwise, you will always have two copies of lam-libs, which may or may not affect you.

Troy

http://www.linuxjournal.com/content/tech-tip-determining-whats-been-changed-rpm-based-systems The following is taken from the rpm man pages (Verify Options section):

c %config configuration file.
d %doc documentation file.
g %ghost file (i.e. the file contents are not
  included in the package payload).
l %license license file.
r %readme readme file.

S file Size differs
M Mode differs (includes permissions and file type)
5 MD5 sum differs
D Device major/minor number mismatch
L readLink(2) path mismatch
U User ownership differs
G Group ownership differs
T mTime differs

rpm -i repoview (or a filename.)

yum --enablerepo=sl-testing update kernel\*

If a the kernel needs to be re-installed:

yum --enablerepo=sl-testing clean all

yum groupinfo "Yum Repositories"

http://paskov.biz/blog/?p=724

sudo ethtool eth0

—-

The ipw2100 module is part of the SL5 kernel, e.g.
/lib/modules/2.6.18-8.1.1.el5/kernel/drivers/net/wireless/ipw2100.ko

You need in addition the ipw2100 firmware:
yum install ipw2100-firmware

remount a volume

umount /aoe ; mount -a

remount a volume with open files

mount -o remount /aoe

ypcat -k auto.master
ypcat -k auto.home

Some SQL examples:

http://www.pantz.org/database/mysql/mysqlcommands.shtml

Change username (?)

update users set username='jowang' where username="jwang";

To add users to the Shop Data Base:

use shopDB;
insert into users set username="aborgolt", realname="Aurelien Borgoltz";
update users set password=password('password') where username="aborgolt";

To list vertically, end the statement in \G instead of ;

mysql> select * from alumni where class=2005\G

To delete evaluations:

delete from evaluations where id<=1440;

Om notes:

show databases;
show tables;
describe <table name>;
select * from <table name>\G
select CONCAT('$', FORMAT(<column name>, 2)) as standard_price;
show index from <table name>;

Logwatch runs in /etc/cron.daily/00-logwatch

/etc/log.d/logwatch.conf

Send a message to the logger

logger This is a test message

restart sysloger

service syslog reload

html redirect:

<META HTTP-EQUIV="Refresh"
      CONTENT="5; URL=http://www.eng.auburn.edu/users/cjroy/">

Here's an article that covers a few tricks that you can do if you telnet to the SMTP port:

http://support.microsoft.com/?kbid=15311

Send mail from bash script

/bin/mail -s "$message_subject" $message_mailto < $message_file

Send mail without client

telnet mail.aoe.vt.edu 25
ehlo hephaistos.aoe.vt.edu
MAIL FROM: bogus@aoe.vt.edu
RCPT TO: lscharf@aoe.vt.edu 
DATA 
Subject: I don't need an e-mail client!
I don't need an e-mail client to send e-mail anymore!
-Luke
.

Steve Edwards wrote:

What prevents anyone from using the server? Is it an open relay?  Or is it because it recognized your email address in the RCPT TO:?

Luke:

It will accept mail that is sent to (RCPT TO:) an @aoe.vt.edu e-mail address from everywhere and everyone (provided they handle errors properly).  It will relay for anyone connecting from a *.aoe.vt.edu DNS name (or who has authenticated with an AOE username and password).

Within those rules, any internet host on the planet can do these kinds of operations.

-Luke

Example: “telnet mail.aoe.vt.edu 25”

[lscharf@hephaistos ~]$ telnet mail.aoe.vt.edu 25
Trying 128.173.188.77...
Connected to mail.aoe.vt.edu (128.173.188.77).
Escape character is '^]'.
220 courier.aoe.vt.edu ESMTP Sendmail 8.13.1/8.13.1; Mon, 12 Jun 2006
15:41:24 -0400
ehlo hephaistos.aoe.vt.edu
250-courier.aoe.vt.edu Hello hephaistos.aoe.vt.edu [128.173.188.50], pleased
tomeet you
250-ENHANCEDSTATUSCODES
250-PIPELINING
250-8BITMIME
250-SIZE
250-DSN
250-ETRN
250-STARTTLS
250-DELIVERBY
250 HELP
MAIL FROM: bogus@aoe.vt.edu
250 2.1.0 bous@aoe.vt.edu... Sender ok
RCPT TO: lscharf@aoe.vt.edu
250 2.1.5 lscharf@aoe.vt.edu... Recipient ok
DATA
354 Enter mail, end with "." on a line by itself
Subject: I don't need an e-mail client!
I don't need an e-mail client to send e-mail anymore!
-Luke
.
250 2.0.0 k5CJfOEC014576 Message accepted for delivery
quit
221 2.0.0 courier.aoe.vt.edu closing connection
Connection closed by foreign host.
[lscharf@hephaistos ~]$ 

Send mail with netcat

http://www.linuxjournal.com/content/sending-email-netcat?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+linuxjournalcom+(Linux+Journal+-+The+Original+Magazine+of+the+Linux+Community)

echo -n "test" | md5sum

“general slow”: check for errors (“dmesg” or /var/log/messages). We have seen a case where a machine would flood syslog and reset the ATA controller because no CD was in the drive..

Otherwise do basic “benchmarking” tests to isolate the component that is slow (hdparm -tT, check for DMA being enabled, check for processor speed not being reduced..) Is the system normally connected to a network, and at the moment is not connected, or is not getting a DHCP lease?

I would do as Jan says and watch as the system is booting. Which service seems slow to start? I would bet it is a network-related service - sendmail, NFS or NIS binding, and the system is either unable to resolve a hostname, or is unable to connect to the relevant server.

Just for fun, remove the swap from the fstab (I know this is a bad idea) and any NFS mounted drives, then reboot.

sql and DS1410d.sys file not found. Set SQLExpress service to manual.

this should set the default printer for the linux system

lpoptions -d MYPRINTER 

Stephen Kelsey Edwards told me to get the next version of the door locks supported by the university, contact

Julie Wesel (?) 231 5121 with Hokie Passport Office $1200/yr

an account on the domain is shared for the visitors in the Undergraduate

username: intldsgn

It does not have a home directory, but it uses the current year share for the international design team.

• Protocol: XMPP
• Screen name: stedwar1
• Domain: im.vt.edu
• Resource: laptop
• Password:
• Local alias: Steve E
• uncheck Remember password

• uncheck New Mail notifications
• uncheck Use this buddy icon for this account

• check Require SSL/TLS
• check Force old (port 5223) SSL
• uncheck Allow plaintext auth over unencrypted streams
• Connect Port: 5223
• Connect server: im.vt.edu
• File transfew proxies: im.vt.edu:7777

• Proxy type: Use Global Settings

I use PDT (PHP Development Toolkit) for Eclipse. It is free (as in beer) and available for Windows, Mac and Linux. And you can use it for coding in Java, C++, … and there are lots of plugins available (CVS, subversion, …).

http://www.eclipse.org/pdt/

Johan

There's quanta in the kdewebdev package.

1. Linus Torvalds
2. Mitchell Baker – Created Linux and Shared it!
3. Mike Milinkovich – Chairwomen of Mozilla Foundation
4. Tim Golden – Senior VP of Bank of America
5. Jim Zemlin – directory of Linux Foundation
6. Peter Fenton – investments include JBoss, Xensource, Zimbra

and Larry Augustin – founded VA Linuz, launched sourceforge

1. Jim Jagielski – co-founder of Apache
2. Michael Tiemann – President of Open Source Initiative
3. Marten Mickos – MySQL (sold to Sun) CEO
4. Marc Fleury – Sold JBoss to RedHat
5. Rod Johnson – CEO of SpringSource; Spring Framework for speeding Java Development apps
6. Jonathan Schwartz – CEO of Sun
7. Mark Shuttleworth – Canonical and Ubuntu
8. John Roberts – SugarCRM

http://www.aoe.vt.edu/~lscharf/samd/?topic=Linux&title=How+to+stop+the+Beeping

termimal

/etc/inputrc
set bell-style visible

vim

/etc/vimrc
set vb (for visual bell)

http://crazytoon.com/2007/05/11/centos-and-redhat-problem-nfs-mount-at-boot-up-fails-with-error-system-error-no-route-to-host/

/etc/init.d/netfs

insert: action $”Sleeping for 30 secs: ” sleep 30
right after: [ ! -f /var/lock/subsys/portmap ] && service portmap start
and right before: action $”Mounting NFS filesystems: ” mount -a -t nfs,nfs4

Highlight Your Shell Prompt When Working as Root April 14th, 2008 by Mitch Frazier in HOWTOs

A useful thing that some distros have started doing is setting the color of your shell prompt differently if you're logged in as root. This gives you an additional visual cue that helps avoid doing things as root when you don't want to. If your distro doesn't do this for you, you can accomplish it by changing your .bashrc files. To set the color of your shell prompt you set the shell variable PS1.

To make the prompt red when you're running as root add this to /root/.bashrc:

PS1="\[\e[31m\]\h:\w#\[\e[m\] "

To make the prompt green when running as a normal user add this to ~/.bashrc:

PS1="\[\e[32m\]\u@\h:\w\$\[\e[m\] "

See the shell man page and search the web for ANSI Escape codes for more info on the meaning of the escape sequences.

http://www.linuxjournal.com/content/10-must-have-firefox-extensions

Sun Chun-Yen's Stop Autoplay
Panic
TabRenamizer
Fast Video Download
Download Helper
File Uploader
FireFTP
ChatZilla
NewsFox
Free Access Plus

Stand alone FTP app:

gftp

https://www.aoe.vt.edu/~stedwar1/Steve/doku/dokuwiki-2009-02-14/doku.php?id=aoe:browsers#add-ons

http://www.howtoforge.org/software-raid1-grub-boot-debian-etch

If the device node is dynamically allocated and not available, try:

cat /proc/partitions
mknod /dev/md3 b 9 3

then

mdadm -C /dev/md3 --level=1 --raid-devices=2 /dev/sda1 /dev/sdb1

or one by one

mdadm --create /dev/md3 --level=1 --raid-disks=2 missing /dev/sda1

set up the file system, then

mdadm --add /dev/md3 /dev/sdb1

Set up filesystem

mke2fs /dev/md3
mount /dev/md3 /mnt/tmp/

replace a drive

mdadm --manage /dev/md3 --fail /dev/sdb1
mdadm --manage /dev/md3 --remove /dev/sdb1
cat /proc/mdstat
mdadm -a /dev/md3 /dev/sdi1
cat /proc/mdstat

config checks

mdadm --query /dev/sda1
mdadm --examine /dev/sda1
mdadm --detail /dev/md1

remove remnants of superblock

mdadm --zero-superblock /dev/sdi1

completely remove or Stop

umount /mnt/tmp
mdadm -S /dev/md3

reconnect disks from an array after -S

mdadm --assemble /dev/md3 /dev/sda1 /dev/sdi1

blockdev --rereadpt /dev/sdb
cat /proc/mdstat
watch -D (difference)
mdadm -D /dev/md3 (detail)
mdadm -E /dev/sdb1

disconnect the drive and add the drive back

mdadm - /dev/md3 - a /dev/sda1

remove

mdadm /dev/md3 -r /dev/sdc1

On SL5.2 the frames were missing for testaccount on tsunami

#  nvidia-xconfig --add-argb-glx-visuals -d 24

brought them back

yum remove libicu
yum remove mono-core
yum clean all
yum install mono-core
yum update

It still doesn't work!

modprobe usb-ohci
modprobe usb-storage

Yoder, Denton wrote:

Looking at the /home folder contents, it appears that ubuntu uses a 755
mask. Isn't that weird to default to letting everyone on a box see everyone
else's files?

Those permissions honor the collaborative tradition – it's pretty standard.

I usually set home directories to 700 and then set up shared group directories with 770.

What are others doing on ubuntu? Or do you just reset home folder
permissions after adding users? Chmod 760 username ?

To remove group and other permission for a particular user's files and directories, you can do the following to set minimal permissions cleanly:

 chmod -R g-w,g-r,g-x,o-w,o-r,o-x ~joeuser

If the user has a webpage hosted from that directory, you might script something like the following in order to set clean, minimal permissions:

 ### Set minimal permissions ###
 chmod -R g-w,g-r,g-x,o-w,o-r,o-x ~joeuser

 ### Make the ~joeuser/public_html Readable to the webserver ###
 # On many Linux distributions, the webserver runs as a user named
 "apache" who is a member of
 # a group named "apache".  In addition to guarding against the
 problem that would arrise if the
 # webserver program were owned, this allows for some
 file-permissions tricks.

 # allow anyone (including the webserver) to traverse joeuser's
 directory.  They won't be able to
 # see a filelist or perform any operations -- but if they know the
 name of a subdirectory that is
 # readable, they'll be able to cd there.
 chmod g+x,o+x ~joeuser

 # Set the group
 chgrp -R apache ~joeuser/public_html

 # Set the directories to rwxr-x--- ; now the user can do anything to
 his/her public_html and
 # children, and members of the apache group can read and traverse
 the directories.  Other users on
 # the machine cannot read this, unless they've been added to the
 apache group.
 find ~joeuser/public_html -type d -exec chmod 750 {} \;

 # Set files to rw-r---- ; now the user can do anything to the files
 in the public_html subtree, except
 # execute them accidentally.  The webserver can read the files as
 well.  Other users on the
 # machine can't read the files unless they've been added to the
 apache group.
 find ~joeuser/public_html -type f -exec chmod 640 {} \;

Anyway, back to the original question, creating the home directory and setting the permissions to something site-specific is just part of my account-creation checklist.

-Luke

To remove group and other permission for a particular user's files and
directories, you can do the following to set minimal permissions cleanly:
chmod -R g-w,g-r,g-x,o-w,o-r,o-x ~joeuser

A little easier way to do the same thing:

chmod -R go-rwx ~joeuser

-Vincent

gkrellm is a system monitor tool

konsole based terminal indicator

http://stackoverflow.com/questions/262657/the-coolest-server-names http://itworld.com/offbeat/61750/would-server-any-other-name-be-functional

visudo
vipasswd

init 5

service --status-all

lshal

cadaver (command line web DAV)

Kopete (IM program)

http://linux.byexamples.com/archives/467/list-command-line-history-with-timestamp/

Add this to the .bash_profile

export HISTTIMEFORMAT="%F %T "

grub
> find /boot/grub/stage1
> find /grub/stage1
> root (hd0,2)
> setup (hd0)

https://help.ubuntu.com/community/RenameUSBDrive Change the label

mlabel -i /dev/sdb1 -s ::CORSAIR

The old label is in the output

Check label

blkid

blkid will list the UUID's for all drives. The UUID can be used in fstab

http://www.linuxplanet.com/linuxplanet/tutorials/7048/1/

[stedwar1@hephaistos ~]$ echo pluto |xargs host
pluto.aoe.vt.edu has address 128.173.188.25

find gpodder-downloads/ -type d -print0 | (xargs -0 echo)

find with -print0 prints a long string delimited with nulls. The echo does not print the string differently.

find gpodder-downloads/ -type d -print0 | (xargs -0I{} echo {};echo end)

This one prints each directory on a separate line.

hawker1 with fedora 11 on the aoe domain was broadcasting portmapper (port 111) each minute. The source was nis. restarting ypbind seemed to fix the issue. Also, NetworkManager was being used, so I stopped and turned off 'NetworkManager' and turned on 'network' with chkconfig

xena:/home/carla# vol_id --uuid /dev/sda2
40295806-448b-4fdf-9ce8-5f5fc7984c9b

Then use the UUID in place of /dev/sda5, or whatever your block device is, like this:

UUID=40295806-448b-4fdf-9ce8-5f5fc7984c9b /home/carla/mydata ext3 user,defaults 0 0

lsb_release -a

awk '/Greylisting/ && /brown/ {getline;print $7}' /var/log/maillog |sort|uniq -c

http://www.howtogeek.com/howto/13706/recover-deleted-files-on-an-ntfs-hard-drive-from-a-ubuntu-live-cd/

sudo ntfsundelete /dev/sda1
sudo ntfsundelete /dev/sda1 –u –m *.jpg
sudo ntfsundelete /dev/sda1 –u –i 14159

http://blogs.techrepublic.com.com/opensource/?p=1389

# smartctl -H /dev/sda
# smartctl -i /dev/sda
# smartctl --test=short /dev/sda
# smartctl --test=long /dev/sda
# smartctl -a /dev/sda

Use smartctl To Check Disk Behind Adaptec RAID Controllers

http://www.linux-mag.com/id/7767

scan each drive using:

smartctl -i /dev/hda

Check drive database:

smartctl -P show /dev/hda

Check health of drive:

smartctl -H /dev/sdb

# Enable SMART permanently

# Turn on offline data collection

# Autosave device vendor-specific attributes through power cycles (so we don’t lose data between power cycles)

smartctl -s on -o on -S on /dev/sdb

Print capabilities of the drive:

smartctl -c /dev/sdb

Short Test

smartctl -t short /dev/sdb

Check log for results of short test:

smartctl -l selftest /dev/sdb

enable extented offline testing

smartctl -t long /dev/sdb

Check log for results of long test

smartctl -l selftest /dev/sdb

Search log for errors:

smartctl -l error -d sat /dev/sdb (-d sat tells it is a sata drive and bypasses drive determination)

list vendor specific attributes:

smartctl -a /dev/sdb

http://sysadmingeek.com/articles/hard-drive-monitor-script-for-headless-linux-servers/

/usr/sbin/smartctl -A /dev/$1 | grep Reallocated_Sector_Ct |tr -s ' '|cut -d' ' -f11

type type
type which
type ls
type set

sluggish processes and causes can be determined by istat

iostat -x

sysstat

yum install sysstat
sar

this shows D jobs–those that are waiting:

top -b -n 1 | awk '{if (NR <=7) print; else if ($8 == "D") {print; count++} } END {print "Total status D: "count}'

http://kerneltrap.org/Linux/High_Idle_Load_Average

echo w > /proc/sysrq-trigger ;dmesg -c > foo

http://www.linuxjournal.com/magazine/hack-and-linux-troubleshooting-part-i-high-load

iostat
iotop

To disable hardware, add to the blacklist:

/etc/modprobe.d/blacklist.conf
  blacklist cdrom

http://www.linux-mag.com/id/7906/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+LinuxMagazine+%28Linux+Magazine%3A+Top+Stories%29&utm_content=Google+Reader

iostat - Report Central Processing Unit (CPU) statistics and input/output statistics for devices and partitions.

IOstat is part of a bigger package of performance monitoring tools called sysstat

The basic command has a few options followed by the device you want to monitor, followed by two numbers. These two are numbers are (1) the time internal between output from iostat, and (2) the number of times iostat is to be run. If you leave the second number blank, iostat will continue indefinitely or until you hit ^c to stop it.

iostat -x -m /dev/md0 1 5

• I used the extended output option (”-x”)
• I chose to have the output appear in megabytes (”-m”)
• I chose to have iostat report the statistics for the device, /dev/md0
• report the values in 1 second intervals and do that 5 times.

From Linux, a couple of programs will talk to a serial port with terminal emulation.

minicom is a good program with all the features for serial communications. minicom must be used from root to access the serial port.

To set up minicom:

minicom -s

To start minicom:

minicom

A configuration file can be saved with a different name and called as such:

minicom switch

Screen is another more fundamental way to talk to serial ports. Check the man page for more details. It's pretty thorough.

screen /dev/ttyUSB0 9600

help

^A ?

to quit

^A K

For Macs using the Cables to Go USB to Serial port, first, load the Mac driver from Prolific.

http://www.prolific.com.tw/eng/downloads.asp?ID=31

Then start the screen session using the following command

screen /dev/tty.usbserial 9600

to quit the screen session:

^A ^\

Here is a link for using the serial port with a Mac:

http://www.tigoe.net/pcomp/resources/archives/avr/000749.shtml

http://www.tuxarena.com/?p=388

Take a screenshot in command-line

import filename.png

Kill processes with ‘pidof’

kill -9 $(pidof firefox-bin)

Resize images from command-line

convert -sample 30%x30% input_image.png output_image.png

Convert MKV to AVI with mencoder

mencoder input_file.mkv -ffourcc xvid -ovc lavc -lavcopts vcodec=xvid:vhq:vbitrate=1800 -oac mp3lame -lameopts vbr=5 -o 

Create ISO images from command-line with genisoimage

genisoimage -o output_file.iso directory_name

Close a port

fuser -k 80/tcp

Format C code using indent

indent -kr source_file.c

Get rid of the system beep temporarily

modprobe -r pcspkr

Get rid of the system beep permanently

blacklist pcspkr

Extract audio only from DVD VOB files

mplayer input_file.vob -aid 128 -dumpaudio -dumpfile output_file.ac3

You can even concatenate VOB files first, e.g.:

cat VTS_01_1.VOB VTS_01_2.VOB VTS_01_3.VOB > ~/output_file.vob

Convert OGV to FLV

ffmpeg -i input_file.ogv output_file.flv

Rip FLAC/WAV to Ogg Vorbis or MP3

oggenc -b 256 input_file.flac -o output_file.ogg

Which will convert input_file.flac to Ogg Vorbis using a bitrate of 256 kbps. To convert FLAC to MP3 you will first need to convert it to WAV using flac -d input_file.flac and then convert the obtained WAV to MP3 using:

lame -b 192 input_file.wav

Which will use a bitrate of 192 kbps.

http://distrowatch.com/weekly.php?issue=20101220#tips

count word usage in file

cat my_text_file.txt | tr -c a-zA-z '\n' | sed '/^$/d' | sort | uniq -i -c

display all combinations of a set of letters

echo {a,c,t}{a,c,t}{a,c,t} | tr -c a-z '\n'

check spelling

echo {a,c,t}{a,c,t}{a,c,t} | tr -c a-z '\n' > complete_list.txt
echo {a,c,t}{a,c,t}{a,c,t} | tr -c a-z '\n' | spell > misspellings.txt
diff complete_list.txt misspellings.txt | awk '{ if (! (NR % 2)) print $2}'

video recording of your desktop

ffmpeg -f x11grab -s wxga -r 25 -i :0.0 -sameq ~/my_video.mpg

http://www.packtpub.com/article/linux-shell-script-monitoring-activities

File sizes

du FILE

List all files and sizes

du -a DIRECTORY

Human readable

du -h

List all files in kilobytes

du -ak SOURCE_DIR | sort -nrk 1 | head
find . -type f -exec du -k {} \; | sort -nrk 1 | head

My favorite for a summary (not sure if it includes hidden files and directories)

du -sh

time COMMAND

Real is wall clock time

User is the amount of CPU time spent in user-mode code (outside the kernel) within the process

Sys is the amount of CPU time spent in the kernel within the process

Write to a file

time -o output.txt COMMAND

Write to a file and append

time -a -o output.txt COMMAND

Format strings

Real time - %e
User - %U
sys - %S

see man page for more

time -f "FORMAT STRING" COMMAND

For example:

time -f "Time: %U" -a -o timing.log uname

Linux

When formatted output is produced, the formatted output of the command is written to the standard output and the output of the COMMAND, which is timed, is written to standard error. We can redirect the formatted output using a redirection operator (>) and redirect the time information output using the (2>) error redirection operator. For example:

time -f "Time: %U" uname> command_output.txt 2>time.log
cat time.log

Time: 0.00

cat command_output.txt

Linux

/usr/bin/time -f "Page size: %Z bytes" ls> /dev/null

Page size: 4096 bytes

#!/bin/bash
#Filename: top10_commands.sh
#Description: Script to list top 10 used commands
printf "COMMAND\tCOUNT\n" ;
cat ~/.bash_history | awk '{ list[$1]++; } \
END{
for(i in list)
{
printf("%s\t%d\n",i,list[i]); }
}'| sort -nrk 2 | head

#!/bin/bash
#Name: pcpu_usage.sh
#Description: Script to calculate cpu usage by processes for 1 hour
SECS=3600
UNIT_TIME=60
#Change the SECS to total seconds for which monitoring is to be 
performed.
#UNIT_TIME is the interval in seconds between each sampling
STEPS=$(( $SECS / $UNIT_TIME ))
echo Watching CPU usage... ;
for((i=0;i<STEPS;i++))
do
  ps -eo comm,pcpu | tail -n +2 >> /tmp/cpu_usage.$$
  sleep $UNIT_TIME
done
echo
echo CPU eaters :
cat /tmp/cpu_usage.$$ | \
awk '
{ process[$1]+=$2; }
END{ 
  for(i in process)
  {
    printf("%-20s %s",i, process[i] ;
  }
   }' | sort -nrk 2 | head
rm /tmp/cpu_usage.$$
#Remove the temporary log file

/usr/java/jdk1.6.0_24/bin/ControlPanel

iperf, mtr and configuring browser with java to enable running NDT.

rsync and wget

"vim"  and "bash"

at/cron (crontabs: how to deal with *useful* output of crontabs and to learn to target mails to the *good* people :)).  Maybe also 'sudo': learn them to *not* use root access

Screen

I've recently had a lot of work to do with OOo Calc and MS Excel. This work reminded me what a great tool awk can be for working with tabular data - not just the ubiquitous "awk '{print $3}' < data.csv".

Emacs for programming enciornments).
sed.
awk.
grep and all the regexp syntax.

sort.

cut.
make
inetd or xinetd.
syslog and its variants.
.bashrc and .bash_profile, and the subtle distinctions between them.

SysV init scripts: too many people try to re-invent those.
Nagios and its monitoring utilits. (Again, too many people try to re-invent those unnecessarily.)
Webmin. (Again, too many people try to re-invent utilities already done well in Webmin.)

Mousepad.  It allows me to save text files in Windows format for all kinds of stuff I have to do for my Widows clients. 

xargs

bash, python, awk, grep, wget, curl, sed, ping, dig, perl

find
wget
screen
wc
grep (and all the fun of regular expressions)
awk
sed

While not necessarily tools themselves, the following may also be interesting:

Use of cron/crontabs
Use of hosts.allow/deny to control access to network services

Or you could do some more advanced things with:

find
vi (and the fun things you can do with regular expressions there)
bash scripting
command pipelines

multitail

screen 
ssh with flags (port forwarding, X forwarding, etc) 
perl 
awk 
curl 
find + xargs  
skill 
mpg123 (hey gotta have some tunes while you power admin stuff) 
a terminal that can do horizontal/vertical splits

Version control (git, hg, svn, cvs)

pushd/popd and "cd -" 
C-r searching and C-p/C-n browsing of command history. 
M-/ completion, TAB completion, 
C-a/C-k/C-y/C-e/M-f/M-b/M-d dorking about with the current command line.
M-. insertion of last word of last command.

http://blog.commandlinekungfu.com/2011/04/episode-144-what-hex.html

od

od -N 48 -x /bin/bash
od -N 48 -t x1 /bin/bash

xxd

xxd -l 48 -g 1 /bin/bash
xxd -p -l 48 /bin/bash
xxd -p -l 48 /bin/bash | sed 's\(..\)/\\x\1 /g'

hexdump

hexdump -C -n 48 /bin/bash

http://bashshell.net/commands/linux-stat-command/

You can use the “-c” switch, along with the appropriate option, if you only want to look at one particular piece of information. For example, if you only want to look at the file’s permissions setting, you can enter:

stat -c%A process.sh
-rw-r--r--

If you want to see information on a particular directory, use the “-f” switch.

stat -f /etc

smbmount is not available for SL. Use this newer method:

mount -t cifs //server/sharename  /mntfolder -o username=,password=

mount -t cifs -o username=stedwar1 //server5.software.vt.edu/tecplot /mnt/smb/